VMware released new security updated vCenter server, 

There are also new patches for the ESXi server.

This updated version of vCenter Server provides part of the hypervisor-assisted guest remediation of CVE-2017-5715 for guest operating systems. For important details on this remediation, see VMware Security Advisory VMSA-2018-0004. The ESXi patches are also required.

See release notes here for:

6.5 U1e: https://docs.vmware.com/en/VMware-vSphere/6.5/rn/vsphere-vcenter-server-65u1e-release-notes.html

6.0 U3d: https://docs.vmware.com/en/VMware-vSphere/6.0/rn/vsphere-vcenter-server-60u3d-release-notes.html

5.5 U3g: https://docs.vmware.com/en/VMware-vSphere/5.5/rn/vsphere-vcenter-server-55u3g-release-notes.html